package com.situ.company.util;

import java.io.IOException;
import java.io.Writer;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletRequest;

import org.json.JSONArray;
import org.json.JSONObject;

public class FmtRequest {

    /**
     * @param <T>
     * @param req
     * @param clazz
     * @param fields
     *            key:属性名，value:参数名
     * @return
     */
    public static <T> T parseModel(HttpServletRequest req, Class<T> clazz, Map<String, String> fields) {
        T obj = null;
        try {
            obj = clazz.newInstance();
        } catch (InstantiationException | IllegalAccessException e1) {
            e1.printStackTrace();
            return null;
        }
        for (Entry<String, String> entry : fields.entrySet()) {
            String value = req.getParameter(entry.getValue());
            String name = entry.getKey();
            try {
                Field field = clazz.getDeclaredField(name);
                field.setAccessible(true);
                field.set(obj, value);
            } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return obj;
    }

    public static <T> T parseModel(HttpServletRequest req, Class<T> clazz) {
        T obj = null;
        try {
            obj = clazz.newInstance();
        } catch (InstantiationException | IllegalAccessException e1) {
            e1.printStackTrace();
            return null;
        }
        Map<String, String[]> map = req.getParameterMap();
        for (Entry<String, String[]> entry : map.entrySet())
            try {
                String name = entry.getKey();
                if ("action".equals(name))
                    continue;
                String val = entry.getValue()[0];
                Field field = clazz.getDeclaredField(name);
                field.setAccessible(true);
                field.set(obj, val);
            } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
                // e.printStackTrace();
            }
        return obj;
    }

    public static void write(Writer wr, String val) {
        try {
            wr.write(val);
            wr.flush();
            wr.close();
            wr = null;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void write(Writer wr, Object val) {
        if (val instanceof Collection<?>)
            write(wr, new JSONArray((Collection<?>) val).toString());
        else if (val instanceof Map<?, ?>)
            write(wr, new JSONObject((Map<?, ?>) val).toString());
        else if (val instanceof String)
            write(wr, val.toString());
        else
            write(wr, new JSONObject(val).toString());
    }

}
